Batman Begins was A - much better than TASM was, and B - followed up by TDK, which was a MASSIVE event. So, unless TASM2 does something similar, TASM won't benefit like BB did. further more, when it comes to Nolan's Batman films, TDK is the one most people remember. Sure, BB is there and well regarded, but TDK is the one people will talk about for 20 years.

Well it's completely subjective whether Begins is "much" better than ASM. I personally don't like Begins and I'm a huge Batman fan.

My point is that Batman (89) being a much bigger event than Batman Begins says nothing about the quality just like SM1 being a huge event says nothing.